Added
* `GeneralMicrosimulation` alias for `Microsimulation`.
* `between(values, lower, upper)` function for variable formulas.
* `and_`, `or_` and `multiply_` functions for variable formulas.
* `any_` and `any_of_variables` helper functions for variable formulas.
Changed
* `is_in` and `amount_over` functions deprecated.
* `select` is now an alias for `np.select`.
* `is_in` will work for both `list` and `*args` inputs.
* `household_net_income` used instead of `net_income` for parameter tests.
Fixed
* Parameter nesting function bug fixes.